Relocation speed: The page relocation speed can be set to 1(Slowest), 2(Slower), 3(Standard), 4(Faster), and 5(Fastest). The default is 3(Standard). If you want to perform tier relocation at high speed, use the 5(Fastest) setting. If you set a speed that is slower than 3(Standard), the load to data drives is low when tier relocation is performed.

Based on the number of the parity groups that constitute a pool, this function adjusts the number of V-VOLs for which tier relocation can be performed at one time. Tier relocation can be performed on as many as 32 V-VOLs in a storage system at once.

After changing the setting, the relocation speed does not change and the data drive load may not change in the following cases:

• The number of parity groups is very few.
• The number of V-VOLs associated with the pool is very few.
• Tier relocations are being performed on the multiple pools.